On completion of graduation, Commander Sajjad Ahmed Khrbey joined Pakistan Navy and got commission in Operations Branch on 16 December 1985. During the service, he served on board PN Ships and Establishments on various posts. He also served in various PN Intelligence setups on different key appointments in Intelligence and security fields. He under gone various professional courses from different institutions of Pakistan Navy, Army, PAF and Civil Defence. He also went abroad to London and Denmark on OJT for security equipment & gadgetries. On completion of 24 years of service, he retired in the rank of Commander on 25 December 2009.

After retirement, he got a private job as General Manager (Admin & Security) in M/S Kings Apparel Industries Pvt Ltd and served for two years. Then he joined Bahria University Karachi Campus as (Deputy Director Admin & Coordination) and served for about 1½ year. He then re-employed in Pakistan Navy on contract basis and posted to National Centre for Maritime Policy Research (NCMPR) Karachi as Deputy Director (Admin & Coordination) and serving till to date.

In addition to his duties, he is also performing research work on the desk of “Traditional Construction of Dhows (Wooden Cargo Boats) in Pakistan, Trade through Dhows and its related issues”.